Polonium tetraiodide
Chemical compound
From Wikipedia, the free encyclopedia
Polonium tetraiodide is a binary inorganic compound of polonium and iodine with the chemical formula PoI
4.[3][4] The compound forms volatile black crystals. [5]
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| Names | |
|---|---|
| Other names
Polonium(IV) iodide | |
| Identifiers | |
3D model (JSmol) |
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| Properties | |
| PoI 4[1] | |
| Molar mass | 716.6 g/mol |
| Appearance | Black crystals |
| Melting point | 200 °C (392 °F; 473 K) |
| Insoluble[2] | |
| Related compounds | |
Related compounds |
Chromium(III) sulfide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis
1. Action of iodine vapor on polonium metal:
- Po + 2 I2 → PoI4
2. Dissolution of polonium dioxide in hydroiodic acid:[6]
- PoO2 + 4 HI → PoI4 + 2 H2O
Properties
Physical properties
The compound forms black crystals that are insoluble in water.
Chemical properties
The compound reacts with hydroiodic acid to form hexaiodopolonic acid:
- PoI4 + 2 HI → H2[PoI6]
It can be reduced by hydrogen sulfide to yield polonium metal.[5] It decomposes on heating.